Image:1r9f biolunit.pdb

DECIDED EASIER TO EDIT OUTSIDE THEN TO MAKE WORK WITH MULTIPLE MODELS LIKE MY MOPRHS SO DIDN"T USE THIS WHICH HAS TWO MODELS. biological unit of 1r9f from http://www.rcsb.org/pdb/files/1R9F.pdb1.gz

From the PDB "Data files contained in the PDB archive (ftp://ftp.wwpdb.org) are free of all copyright restrictions and made fully and freely available for both non-commercial and commercial use. "